Weldless drill jar



e. R. WATSON. WELDLESS DRILL JAR. Y

APPLICATION FILED SEPT; 24, 1920.

Fig. 1. Fig. 3.1 7 33. F .4. Aztarm y.-

PatentedFeb. 7, 1922.

unites stares earner cement,

. GEORGE n. werson, or warmatooprown, ASSIGNOR "ro ARMsTimnGMANUF C-Iroams cor/Lenny, or WATERLGO, rowel, a GORPORATIONOE DELAWARE. I

WELDLEss DRILL JAR.

To all whom it may concern: I

Be it known that l, Gn'onen R. \VATSON, a citizen of the United Statesof America, and a resident of 'lVaterlom-Black Hawk County, Iowa, haveinvented certain new and useful Improvements, in VVeldless Drill Jars,of

which the following is a specification.

This invention relates to improvements inweldle'ss drill-jars, and theobjectof my improvement is. to supply jars of: drilling tools whichareso constructed as-to be .free from welds to therebyistrengthen them,this construction being. efi'ected by a method suited to the purpose. l1- I have accomplished thisqobjectaby the method and construction whichare hereinafter-described and" claimed, and which are illustrated in theaccompanying drawings, in which Fig. 1 is an elevation of the slidablyinterlocked members of my improved jar; Fig. 2 is a like elevation ofthe device with parts of onemember or rein in medial longitudinalsection; Fig. 3 is an elevation of the parts shownin said Fig. 1, at anangle of ninety degrees therefrom; Fig. 4 is a medial longitudinalsection taken along the plane of meeting of the abutting flat faces ofthe members of the device; Figs; 5 and 6 are like perspective views ofthe upper member, the locking feather being shown respectively inincomplete and in finished condition, and Fig. 7 is a crosssection ofsaid interlocked members taken on the broken line 7-7 of said Fig. 1.

Similar numerals of reference denote corresponding parts throughout theseveral views. i

Drill-jars for well-drilling tools are usually interlinked closed loopedmembers or reins interlocked] against all but limited longitudinalsliding movements relative to each other. The parts of each pair ofreins which are adjacent the head of the member are welded to the head.commonly by tongue and groove joint. This junction of the reins with thehead is termed the anvil because it has to sustain the. jarring impactsof the adjacent or hammer end of the other sliding member at times whenthe device is being actuated by to and fro sudden movements in thedirection of its length in order to dislodge toolsconnected to thedevice which have become lodged in a drill hole. This welded junctionpart thus is subjected to severe concussions which tend Specification ofLetters Patent. ate t F b-,7 ,[192g," Application filed. Septembcr24,1920.' seria1-No.412,57e. 71 w to'cry-stallize its structure and also,to fracture it at the welded. surfaces, especially, if there issome'i'mperfection'in the welding. Such a fracture often results. in thelosszof the drilling tools, and even innecessary. abandonment of thedrill-hole because i of an impossibility of removing the grappling orother means.

I have, theref re, in this inventionadopted such a. construction of andmethodof interlocking the linkedmembers as will obviateany necessity forwelds in either member. v v The drill-jardevice illustrated contains twomembers 1 and1O which are alike in forin,'- except that the upper member1' has a. threaded frustalf stud 2 foricorinection with a couplingmember, not shown, on a tool by tool-carrying cable, while the head ofthe I other member has a counterpart interiorly threaded socket 11 forconnection with a similar stud on a suspended tool. Each member has itshead portion squared at 3 to receive a wrench. Each of said members hasfrom a shoulder 1 a part5 extending thence, the part 5 beingsemi-cylindrical with a fiat face in a longitudinal medial planeintersecting the axis of the member, so that when the two members 1 and10 are reversed relatively to each other both longifabout half way alongits length. This slot is relatively narrow from the flatface of. themember outwardly, but is gradually widened outwardly as shown in Fig; 7starting from a limit'somewhat-more than one-half of its depth... On theflat face of each part 5, extending longitudinally and medially from itsextremity 12 which is slo-pingly reduced from each side, is alatertudinally and transversely, the flat surfaces 7 ally projectingfeather or key Swhose width is but slightly less than the narrower widthof the slot 6 in theother member 10 in which a .is longitudinallyslidable. Initially, the

6 (if the opposite member it will project therefeather 8 is of thetabular form shown in Fig. 5, so that when it is mounted'in the slotbeyond. When said incomplete members are thus assembled, the outer partsof the feathers 8 are appropriately treated to upset them and widen themat 9, so that the i widened terminals 9, as shown in Fig. 7, slidinglyfit the outer wider opening 7 of the slot 6, with the outer face of thefeather 9 flush and of the same curvature with the outer cylindricalsurface of the part 5. This feather 8, and its upset terminal 9,interlocks said members 1 and 10 for relative longitudinal slidingmovements only.

This method of construction of the members obviates welding and thus theheads 1, at their junctions with the reins 5 at the shoulders 4, arefreed from any structural weakness, such as would be due to welding atthis location.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is:

1. A weldless drill-jar, comprising two members interlocked for relativelongitudinal movements, each member being longitudinally slotted, andeach member having a lateral feather mounted in the longitudinal slot ofthe other and terminally upset to. lock it to the other member. I

2. A weldless drill-jar, com-prising two members, each member beingprovided with a, longitudinal slot having two lateral widths, and eachmember having a lateral longitudinal feather whose body slidably fitsthe narrower part of the slot in the other member, the outer edge partof each feather being upset to slidingly fit the wider part of the slotin the other member.

3. The method of making drill-jars, which consists in interlocking twopartially formed members, each having a longitudinal slot and a lateralprojection fitting the slot in the other member, with each projectionprojecting beyond said slot, upsetting the projecting part of eachprojection to render it terminally wider than the width of the slot.

4. The method of making drill-jars, which consists in interlocking twopartially formed members, each having a longitudinal slot of two widthsand a lateral projection fitting the narrower and adjacent part of theslot in the other member to project through the slot and beyond it,upsetting the projecting part of each projection terminally to slidablyfit the wider part of the slot.

Signed at Waterloo, Iowa, this 27th day of August, 1920.

GEORGE R'WATSON,

